The AD1938 is a high performance, single-chip codec that provides four analog-to-digital converters (ADCs) and eight digital-to-analog converters (DACs), supports 24 bits and 8kHz to 192kHz sample rates, supports SPI control, right/left/I2S/TDM modes, master/slave modes, and is suitable for automotive audio systems, home theater systems, set-top boxes and digital audio effects processors.
The AD1938 codec from Analog Devices provides four analog‑to‑digital converters and eight digital‑to‑analog converters in a single 48‑lead LOFP package. It operates from a 3.3 V single supply and supports sample rates from 8 kHz to 192 kHz with 24‑bit word width. The device includes an SPI port for software‑controlled volume, mute, and power‑down functions, and offers both master and slave clock modes.
Designed for low EMI applications, the AD1938 features an on‑board PLL that can generate the master clock from an external crystal or the LR clock. Detailed specifications cover analog performance, digital I/O, power consumption, timing, and absolute maximum ratings, making it suitable for automotive audio, home audio, and professional audio equipment.
| Supply Voltage (AVDD, DVDD) | 3.3 V |
|---|---|
| Word Width | 24 bits |
| Sample Rate | 48 kHz (typical) |
| ADC Dynamic Range | 108 dB |
| Volume Control Range | 95 dB |
| Interchannel Isolation | 100 dB |
| Power Consumption (All Supplies) | 429 mW |
| Operating Temperature Range | –40 °C to +125 °C (case) |
The AD1938 operates from a 3.3 V digital and analog supply.
It is functionally guaranteed from –40 °C up to +125 °C case temperature.
The device is offered in a 48‑lead Low‑Profile Quad Flat Package (LOFP).
The volume control can be adjusted over a 95 dB range.